Mahrez was on the bench for the home defeat by Everton last time out after Ranieri felt the winger was tired.
“I watched him during the training session last week and he was a little tired," Ranieri told lcfc.com. "He worked so hard 10 men verses 11 at Stoke.
“I decided to give him a little rest and I want to see his reaction now he feels better. I am waiting for a very good reaction."